Preparation device and method for multicomponent copolymerized polypropylene

A preparation device for multicomponent copolymerized polypropylene, wherein the preparation device comprises a propylene feeding pipeline, a catalyst feeding pipeline, an ethylene feeding pipeline, a butene feeding pipeline, a polypropylene discharging pipeline, a catalyst pretreatment unit, a polymerization unit, a low-pressure degassing unit, and a powder inactivation and drying unit, wherein,

• the catalyst pretreatment unit comprises a catalyst stirring tank, and the bottom portion of the catalyst stirring tank is connected to the top portion of the catalyst stirring tank and the top portion of the vertical liquid-phase reactor, respectively;
• the polymerization unit comprises a propylene cooling and separation column, a loop reactor, and n vertical liquid-phase reactors provided in parallel, where n≥1;
• the top portion of the vertical liquid-phase reactor is connected to the upper portion of the propylene cooling and separation column, the bottom portion of the vertical liquid-phase reactor is connected to the loop reactor, and a hydrogen make-up line is provided at the upper portion of the vertical liquid-phase reactor;
• a reflux line is provided at the bottom portion of the propylene cooling and separation column, and the reflux line is connected to the upper portion of the propylene cooling and separation column and the upper portion of the vertical liquid-phase reactor, respectively;
• the low-pressure degassing unit comprises a low-pressure bag filter, and the bottom portion of the low-pressure bag filter is connected to a deactivation zone of an integrated powder inactivation and drying machine;
• the loop reactor is connected to the low-pressure bag filter;
• the powder inactivation and drying unit comprises the integrated powder inactivation and drying machine, a propylene water scrubber, a film recovery unit, a low-pressure steam feeding pipeline, and a low-pressure nitrogen feeding pipeline;
• the integrated powder inactivation and drying machine comprises the deactivation zone, a degassing zone, and a drying zone provided in sequence;
• a solid-gas separator I is provided at a dome of the deactivation zone, and a gas-distribution device I is provided at the bottom portion of the deactivation zone;
• the top portion of the solid-gas separator I is connected to the propylene water scrubber, the bottom portion of the solid-gas separator I is connected to the deactivation zone, and the top of the propylene water scrubber is connected to a gas-distribution device II;
• the gas-distribution device I is connected to the low-pressure steam feeding pipeline and the low-pressure nitrogen feeding pipeline, respectively;
• the solid-gas separator II is provided at the dome of the degassing zone, and the gas-distribution device II is provided at the bottom portion of the degassing zone;
• the top portion of the solid-gas separator II is connected to the film recovery unit, the bottom portion of the solid-gas separator II is connected to the degassing zone, and the film recovery unit is connected to the gas-distribution device I;
• the solid-gas separator III is provided at the dome of the drying zone, a gas-distribution device III is provided at the bottom portion of the drying zone, and the lower portion of the drying zone is connected to the polypropylene discharging pipeline;
• the top portion of the solid-gas separator III is connected to the gas-distribution device III, and the bottom portion of the solid-gas separator III is connected to the drying zone;
• the catalyst feeding pipeline is connected to the catalyst stirring tank;
• the propylene feeding pipeline is connected to the catalyst stirring tank, the propylene cooling and separation column, and the loop reactor, respectively;
• the ethylene feeding pipeline is connected to the vertical liquid-phase reactor and the loop reactor;
• the butene feeding pipeline is connected to the loop reactor.